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New Controversy: Is Khloe Really a Kardashian?

Kris Jenner shot down the rumors questioning Khloe's paternity telling E! News that the gossip is "So stupid ... All so silly. Just another day!!!"

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Is Khloe Kardashian not really a Kardashian? It's been the subject of water cooler talk for years: Khloe looks dramatically different from sisters Kim and Kourtney, from her proportions to her facial features. Now, two ex wives of the late Robert Kardashian are speaking out, saying this is a secret he took to his grave.

Jan Ashley -- Robert's first spouse after he divorced Khloe's mom, Kris -- tells ET that Robert supposedly always knew that Khloe wasn't his, but he loved her very much and always treated her just the same as the other siblings.

Robert's wife at the time of his death, Ellen Kardashian, spoke to Radar Online and Star magazine, out now, saying that she had asked her husband about the validity that Khloe could have a different father -- and he responded that he was having trouble with his marriage at the time, "So he did question the fact that Khloe was his."

A source close to Kris tells ET of the allegations, "This is ridiculous - of course Khloe is Robert's child," and this morning Khloe tweeted her outrage, likely to her two stepmoms, saying, "The audacity you have to mention my father’s name like this! Should be ashamed of urself! I let a lot of things slide but this one is really low… YOU ARE DISGUSTING! (yes you know who YOU are)."